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Pfannerstill EY, Arata C, Zhu Q, Schulze BC, Ward R, Woods R, Harkins C, Schwantes RH, Seinfeld JH, Bucholtz A, Cohen RC, Goldstein AH. Temperature-dependent emissions dominate aerosol and ozone formation in Los Angeles. Science 2024; 384:1324-1329. [PMID: 38900887 DOI: 10.1126/science.adg8204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 04/22/2024] [Indexed: 06/22/2024]
Abstract
Despite declines in transportation emissions, urban North America and Europe still face unhealthy air pollution levels. This has challenged conventional understanding of the sources of their volatile organic compound (VOC) precursors. Using airborne flux measurements to map emissions of a wide range of VOCs, we demonstrate that biogenic terpenoid emissions contribute ~60% of emitted VOC OH reactivity, ozone, and secondary organic aerosol formation potential in summertime Los Angeles and that this contribution strongly increases with temperature. This implies that control of nitrogen oxides is key to reducing ozone formation in Los Angeles. We also show some anthropogenic VOC emissions increase with temperature, which is an effect not represented in current inventories. Air pollution mitigation efforts must consider that climate warming will strongly change emission amounts and composition.
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Affiliation(s)
- Eva Y Pfannerstill
- Department of Environmental Science, Policy and Management, University of California at Berkeley, Berkeley, CA, USA
| | - Caleb Arata
- Department of Environmental Science, Policy and Management, University of California at Berkeley, Berkeley, CA, USA
| | - Qindan Zhu
- Department of Earth and Planetary Science, University of California at Berkeley, Berkeley, CA, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA
- NOAA Chemical Sciences Laboratory, Boulder, CO, USA
| | | | - Ryan Ward
- NOAA Chemical Sciences Laboratory, Boulder, CO, USA
| | - Roy Woods
- Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Colin Harkins
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA
- Department of Meteorology, Naval Postgraduate School, Monterey, CA, USA
| | | | | | - Anthony Bucholtz
- Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Ronald C Cohen
- Department of Earth and Planetary Science, University of California at Berkeley, Berkeley, CA, USA
- Department of Chemistry, University of California at Berkeley, Berkeley, CA, USA
| | - Allen H Goldstein
- Department of Environmental Science, Policy and Management, University of California at Berkeley, Berkeley, CA, USA
- Department of Civil and Environmental Engineering, University of California at Berkeley, Berkeley, CA, USA
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